(1) Having the same number of vibrations; homophonous.
(2) Music in octaves for mixed voices or instruments.
(3) Unisons; two or more parts playing in unison with each other, or at the octave, according to the character of the instrument or voice." [A Dictionary of Musical Terms; Novello, Ewer and Co., London, pre-1900]
Law of Attraction
Law of Chemical Affinity
Law of Cycles
Law of Force
Law of Harmony
Law of Sympathetic Oscillation